[PATCH bpf] cacheinfo: move get_cpu_cacheinfo_id() back out

[Jakub Kicinski <kuba@xxxxxxxxxx>]

This commit more or less reverts commit 709c4362725a ("cacheinfo:
Move resctrl's get_cache_id() to the cacheinfo header file").

There are no users of the static inline helper outside of resctrl/core.c
and cpu.h is a pretty heavy include, it pulls in device.h etc. This
trips up architectures like riscv which want to access cacheinfo
in low level headers like elf.h.

Link: https://lore.kernel.org/all/20211120035253.72074-1-kuba@xxxxxxxxxx/
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
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x86 resctrl folks, does this look okay?

I'd like to do some bpf header cleanups in -next which this is blocking.
How would you like to handle that? This change looks entirely harmless,
can I get an ack and take this via bpf/netdev to Linus ASAP so it
propagates to all trees?
---
 arch/x86/kernel/cpu/resctrl/core.c | 20 ++++++++++++++++++++
 include/linux/cacheinfo.h          | 21 ---------------------
 2 files changed, 20 insertions(+), 21 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index bb1c3f5f60c8..3c0b2c34be23 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -284,6 +284,26 @@ static void rdt_get_cdp_l2_config(void)
 	rdt_get_cdp_config(RDT_RESOURCE_L2);
 }
 
+/*
+ * Get the id of the cache associated with @cpu at level @level.
+ * cpuhp lock must be held.
+ */
+static int get_cpu_cacheinfo_id(int cpu, int level)
+{
+	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
+	int i;
+
+	for (i = 0; i < ci->num_leaves; i++) {
+		if (ci->info_list[i].level == level) {
+			if (ci->info_list[i].attributes & CACHE_ID)
+				return ci->info_list[i].id;
+			return -1;
+		}
+	}
+
+	return -1;
+}
+
 static void
 mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 2f909ed084c6..c8c71eea237d 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -3,7 +3,6 @@
 #define _LINUX_CACHEINFO_H
 
 #include <linux/bitops.h>
-#include <linux/cpu.h>
 #include <linux/cpumask.h>
 #include <linux/smp.h>
 
@@ -102,24 +101,4 @@ int acpi_find_last_cache_level(unsigned int cpu);
 
 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
 
-/*
- * Get the id of the cache associated with @cpu at level @level.
- * cpuhp lock must be held.
- */
-static inline int get_cpu_cacheinfo_id(int cpu, int level)
-{
-	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
-	int i;
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == level) {
-			if (ci->info_list[i].attributes & CACHE_ID)
-				return ci->info_list[i].id;
-			return -1;
-		}
-	}
-
-	return -1;
-}
-
 #endif /* _LINUX_CACHEINFO_H */
-- 
2.31.1